<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport"
        content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>两栏布局</title>
  <style>
      html, body {
          margin: 0;
          width: 100%;
          height: 100%;
      }

      .container {
          clear: both;
          background: orange;
          width: 100%;
          height: 100%;
      }

      .left {
          float: left;
          width: 200px;
          height: 100%;
          background: red;
      }

      .right {
          float: right;
          width: calc(100% - 200px);
          height: 100%;
          background: green;
      }
  </style>
</head>
<body>
<div class="container">
  <div class="left"></div>
  <div class="right"></div>
</div>
</body>
</html>
